Safety locking device for elevators.



A. T. MACKIE. SAFETY LOCKING DEVICE FOR ELEVATORS.

APPLICATION FILED JULY 22,1914.

Patented July 17,1917.

2 SHEETSSHEET I.

A. T. MACKIE. SAFETY LOCKI-NG DEVICE FOR ELEVATORS.

APPLICATION FILED JULY 22,1914. 1 ma ma, Patented J111y17, 1917.

2 SHEETS-SHEET 2.

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v1: marina I ALEXANDER T. MACKIE, 013 BOSTON, MASSACHUSETTS, ASSIGNOR TO HENRY N. SWEET,

OF BOSTON, MASSACHUSETTS.

SAFETY LOCKING DEVICE FOR ELEVATORS.

Specification of Letters Patent.

Patented July 17, 1917.

Application filed July 22, 1914. Serial No. 852,372.

To all whom it may concern:

Be it known that I, ALEXANDER T. MAGKIE, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented. new and useful Improvements in Safety Locking Devices for Elevators, of which the following is a specification.

My invention relates to elevators and has for its object to improve the construction thereof by providing an automatic safety control whereby it is made impossible for the car to be started or to be put in motion while the entrance door of the passage to the car is open, and also impossible 'forthe entrance door to be opened until the operating member of the car is locked in stop position, thus protecting persons entering or leaving the car from injury through movement of the latter, or otherwise, while they are passing through the doorway.

The invention consists of an elevator whereof the door of the doorway through which the passengers pass tovand from the car is normally locked in its closed position and is unlocked and can be opened only when the operating member of the car occupies stop position, and whereby said operating member is locked in stop position by the opening of the door and is unlocked and can be moved to start the car only when the door is closed. Other features of my invention are hereinafter pointed out.

In the accompanying drawings:

Figure 1 is a diagrammatic view of part of a building provided with an elevator equippedwith my new automatic safety control;

Fig. 2 is a front elevation, on larger scale, of the operating member of the car;

Fig. 3 is a side elevation of the operating member of the car, including a diagrammatic showing of the circuits provided on the car and at each landing; and A Fig. 4 is a plan view of the quadrant for the operating member.

Having reference to the drawings, 1 and 2 represent two floors of a building and 3 an elevator well within which is arranged a car 4. The car 4 is provided with an operating member 5 by means of which the car operating power is controlled. This member 4 extends upwardly through a quadrant 6 and is provided with the usual sliding spring pressed latch 7 to engage the usual centrally disposed quadrant notch 8 to lock said member in itsv middle or stop position. Fixed to one side of quadrant 6 is a solenoid 9 whose core 10 cooperates with a perforated arm 11 fastened, to one side of member 5 so that when said member occupies its middle position the perforation 12 of said arm is immediately above or in line with the core 10 and will receive the end of the latterwhen the solenoid 9 is energized and lifts said core. The latch 7 is made with a laterally projecting arm 13 extending through a slot 13 provided in member 5, and this arm 13 has mounted in it a vertically movable contact 14, which is yieldingly pressed clownward by a spring 15, and whose upper end is provided with stop nuts 16 which limit the downward movement of said contact. The contact 14 cooperates with a fixed contact l? mounted in, but insulated from, a lug 18, provided upon the rear side of quadrant 6.

Upon the exterior of the car 4 are mounted three contact shoes 19, 20 and 21, coiiperating respectively with contacts 22, 23 and 24, provided adjacent each landing. Each set of contacts 22, 23 and 24, is mounted upon the wall of well 3 and is located relative to its landing so that the contacts 19, 20 and 21 register and contact therewith only while the floor of the car is near the level of the landing.

Each door 25 of the well is hung on trucks 26 traveling on a rail 26' and is opened and closed by shifting it on said rail. Projecting from each door 25 is an arm 27 provided upon its upper side with a shoulder 28, said arm cooperating with the core 29 of a solenoid 30 and with a spring contact member 31 forming part of a door operated switch 32 that is fixed to the wall of well 3. Each switch 32 also includes a fixed contact mem ber 33. The switch 32 is arranged with respect to its door so that when the latter is moved into its closed position the arm 27 pushes and holds the contact, member 31 out of engagement with the fixed contact 33, and when said door is moved from its closed position the spring contact member 31 en gages the fixed contact 33.

- At 35 and 36 are shown two line wires that are connected with a current supply, and one end of the winding of each solenoid 30 is connectedby a' wire 34with-line wire 35, r

the opposite end of said winding being connected by a wire 37 with the contact 22 of the landingat which the solenoid is located. The'fixed Contact 33 at each landing is connected by a wire 38 with the wire 34 leading to line wire 35 while the contact 31 isv connected by a wire 39 with the contact 23 of said la nding. The contact 24 at each landing is connected by a wire 40 with line wire 36.

, ,On the car 4 theicontact shoe. 19 is connected by a .wire41 with thecontact 17 7 rant 6." a

It will thuslbe seen that when the car is at one of the landings and member 5 is I 'swung' up into stop position and latch 7 is allowed to drop into notch 8,-then :the contact shoes 19] and 21 are connected through wire 41, contacts 17 and14, latch 7',

' member 5, quadrant 6 and wire 44. XVith the car thus stopped at one of the landings the contact 19 willbe in engagement with contact; 22 of .said landing which is con nected through wire 3 7, solenoid 30and wire 34 with line wire 35,while the contact 21 will be inengagement with the contactj24 which is directly connected by wire 40 with the other line wire'36; Thus, when the fear isbroughtinto position at any one of the landings and stopped, a circuit is closed through the solenoid. 30 of said landing when the operator drops latch 7 into look ing notch 8, andsaid, solenoidlifts its core 29 and thereby unlocks the door of said landing,-but it will be clear that merely stopping the car at the landing does not close the solenoid circuit and unlock the door, the latter being effected only when the operator of the car permits the latch? to drop into notch '8, which is necessary to cause the contact 14 to engage contact 17 so that member 5:must be locked in stop position before the door can be opened. When the door of the landing is opened the spring contact 31 closesonto contact 33 and thereby completes a circuit through the solenoid9 on the car. This circuit is traced as follows from line wire 36 through wire40, contacts 24 and 21 and wires 44 and 43 to one end of the winding of the solenoid 9 and-from the opposite end of the winding of said solenoid through wire 42,"c0ntacts 20 and 23, wire 39, contacts 31 and 33 and wires 38 and 34 to the other line wire 35. When'thesolenoid 9 is thus energized it lifts its armature upward into the hole 12 of the arm 11 projecting from the 'member 5 thereby locking said member in st'op' position independ ently of the manually controlled latch 7, so that it cannot be shifted from that position until the door is again closed. p

From the above description it will be clear that all of the doors of the elevator well are normally locked and can be opened only when the car is brought into position oppositeone of the landings, stopped, and the operating member thereof locked instop position by the usual manually controlled latch. Also that when the operating member 5 is locked in stop position by a sup plemental automatically controlled member immediately one of the doors 25 is. opened and can be freed and operated to start the car only by closing the door.

\Vhile I prefer the construction and arrangement herein shown and described as affording the greatest degree of protection and safety, yet it will be clear that the doorlocking apparatus may be installed upon the well doors as herein shown, or, the car door or both doors.

I claim: 1

1. 'In an elevator, in combination, a car;

an operating member-for said car; a door for the passageway through which access is had to said car; means controlled by said operating member for locking said door in its closed position and adaptedto be operated by said member to free said door only when said operating member occupies and is locked in stop position, and means, controlled by the door, for locking said operating member in stop position when the door is opened so that said operating member is unlocked and can be shifted to start the car only when the door occupies its closed position. i v In an elevator, in combination, a car; a door for the passageway through which access is had to said car; means normally locking said door in its closed position; an operating member for said car provided with a manually operated latch for holding said member in step position; means controlled by said latch for operating the doorlocking means to free the door When said latch is operated to secure said member in stop position, and means independent of said latch and controlled by said door for locking said member in stop position while the door isiopen.

3. In an elevator, in combination, a car; an operating member for controlling the movement of said car; a manually controlled latch for locking said operating member in stop'position; a door for the passageway through which access is had'to said car; means for locking said door in its closed position whilethe car is in motion, and means through which the locking movement of said latch actuates said door-locking means,to' free said door.

4. In'an elevator,in combination, aear an operating member for said car; a manually controlled latch for holding said operating member in stop position; a door for the passageway through which access is had to said car; means for locking said door in its closed position while the car is in motion; means through which the looking movement of said latch operates said door locking means to free said door, and means independent of said latch for automatically locking said member in stop position while the door is open.

5. In an elevator, in combination, a car; an operating lever for controlling the movement of said car: a manually operated latch mounted on said lever for locking the latter in stop position; a well provided with a doorway through which access is had to the car; a door for said doorway; means normally locking said door closed; means controlled by said latch for actuating said locking means to free said door, said latch controlled means comprising a stationarily supported member positioned to cooperate with said latch only when said lever occupies stop position.

6. In combination, an elevator car; an operating member for controlling the movement of said car; a manually controlled latch mounted on said operating member for locking said member in stop position; a stationary fixture having a notch to cooperate with said latch; a doorway through which access is had to said car; a door for said doorway; an electrically-operated lock for securing said door in its closed position; a circuit in which said lock is arranged and a switch in said circuit that is actuated by the locking movement of said latch into said notch so as to operate said circuit and thereby unlock said door.

7. In combination, an elevator car; an operating member for said car; a manually controlled latch for locking said member in stop position; a doorway through which access is had to said car; a door for said doorway; an electricallyoperated lock nor-i mally securing said door in its closed position; a circuit in which said lock is arranged; a switch in said circuit that is actuated by said latch to close said lock circuit and free said door when said latch is shifted to lock said member in stop position; an electrically-operated lock for securing said operating member in stop position; a circuit in which said lock is arranged and a normally open switch in said circuit that is closed to lock said operating member in stop position when the door is opened.

8. In combination, an elevator well; a set of contacts mounted upon the wall of said well adjacent the landing; a doorway for said landing; a door for said doorway; an electrically operated lock normally securing said door in its closed position; a door operated switch at said landing; an elevator car in said well; a set of contacts mounted on said car and adapted to register and engage with the first mentioned set of contacts when the car is at said landing; an operating member for said car; a manually controlled latch for securing said operating member in its stop position; an electrically operated lock on said car for securing said operating member in its stop position a switch on said car actuated by movement of said latch into locking position; conductors connecting the lock and switch on the car with the contacts carried by the car and conductors connecting the lock and switch at the landing with the contacts on the well, said conductors connecting each set of contacts with its lock and switch so that when the car is at the landing the switch on the car is in circuit with the door look at the landing and the switch at the landing is in circuit with the lock on the car for the operating member.

Signed by me at Boston, Massachusetts, this 21st day of July, 1914.

ALEXANDER T. MACKIE.

Witnesses:

J osnrrr T. BRENNAN, MARY A. NYHAN,

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. O. 

